Lethio

Time Converter

Converts times on web pages to your local timezone. Available for Chrome and Firefox.

Install for Chrome Install for Firefox

Display

Choose how the converted time appears. These examples show 2:30 PM UTC in 24-hour format, with UTC as the target timezone.

On hover

2:30 PM UTCLocal Time: 14:30

Original and converted

2:30 PM UTC (14:30)

Converted only

14:30

In Settings, you can choose 12- or 24-hour format and a different target timezone.

Website access

Click the toolbar icon and select Enable on this site to start converting times.

To use it everywhere, turn on Enable on all websites in Settings and accept the browser's permission request. This is off by default. You can exclude individual sites from the toolbar popup.

Source code

The extension is open source, under the MIT License.

Build and load it yourself
  1. Clone or download the repository. Install Node.js 22.20 or later.
  2. Run npm ci, then npm run build.
  3. Chrome: Open chrome://extensions, enable Developer mode, and use Load unpacked to load dist/chrome.
  4. Firefox: Open about:debugging#/runtime/this-firefox and use Load Temporary Add-on to load dist/firefox/manifest.json.

Privacy Policy

Last updated: October 3, 2026

Time Converter processes page text locally using the bundled Luxon library. It does not send page contents or browsing history to a server, and includes no analytics, tracking, or error reporting. No account is required.

Stored settings

Time format, display mode, target timezone, and the on/off setting use browser sync storage. Your browser may sync them through its account service. Lethio has no access to that account or those settings.

The all-site setting and lists of permitted and excluded websites stay in local extension storage. These lists record your site choices, not the pages you visit.

Permissions

storage saves settings. activeTab identifies the current website when you open the popup. scripting loads the conversion code and styles on enabled sites.

Website access is granted through your browser, for individual sites or all HTTP and HTTPS sites. You can revoke it in the browser's extension controls. Turning off all-site access removes the broad permission; you may need to allow individual sites again in Settings.

Removal

Uninstalling removes local settings and site choices from that browser. Synced preferences are managed through your browser's synchronization controls.

Chrome Web Store policy

The use of information received from Google APIs and browser permissions will adhere to the Chrome Web Store User Data Policy, including the Limited Use requirements.

Contact

Questions about this policy or the extension? support@lethio.com